Merging Skins Help

Hey, I want to merge two of these skins so that they're half and half(left side one skin, right side the other). Is there anyone who can do that for me? The skins are attached to this thread. Preferably the first skin will be on the left side of the merged skin. Thanks.

(P.S. this same thread is in another discussion but I put it here because more people check this)